# import and from...import
import sys 
print('命令行参数为：')
for i in sys.argv:
    print(i)
    print('\n python path:',sys.path)
from sys import argv,path # 导入模块的某个函数
print('path:',path)

import math # 导入数学模块
a = math.sqrt(9)
print(a)
from math import sqrt
b = sqrt(16)
print(b)